采用硫化锂（Li2S）作为锂硫电池的正极，负极就能够使用硅或锡等代替金属锂，可彻底解决金属锂带来的安全隐患和不稳定问题。但价格高、难制备、导电性差以及在空气中不稳定等因素，严重阻碍Li2S的实际应用。本项目提出一种直接制备Li2S电极的新方法，拟采用硫酸锂在惰性气氛中高温下氧化织造碳纤维载体，刻蚀织造碳纤维的同时将还原生成的Li2S原位负载在其中，一步制得织造碳纤维-Li2S复合电极。通过揭示其原位构筑的机制和织造碳纤维载体同步刻蚀的机理，实现织造碳纤维-Li2S复合电极的可控制备和结构调控。在此基础上，再通过深入研究织造碳纤维-Li2S复合电极中的离子扩散机制和电化学反应本质，揭示其中离子扩散的动力学，阐明其微观结构、界面特性、离子扩散规律与电化学极化、电化学性能之间的关系及调控机制，明确其电化学性能的衰减机理和循环稳定机制，为高稳定性、轻量化锂硫电池的研究提供新的思路和理论指导。

Unlike elemental sulfur, lithium sulfide (Li2S) is in a fully-lithiated state and can be paired with lithium metal-free anodes, such as silicon or tin, thus obviating the safety concerns and dendrite formation associated with lithium metal. However, there are several significant issues that currently limit the utilization of Li2S. Li2S is expensive and facile synthesis routes are not yet readily available. Additionally, problems related to the insulating nature and polysulfides shuttling still exist as in elemental sulfur cathodes. Furthermore, Li2S is highly moisture- and oxygen-sensitive, necessitating a controlled atmosphere whenever it is handled. To solve these shortcomings, herein, we propose a new method for one-pot synthesis of the textile carbon fibers supported Li2S (TCFs-Li2S) composite cathode through direct pyrolysis of a mixture of textile carbon fibers and lithium sulfate. In this process, the textile carbon fiber matrixes are oxidized and etched in situ by lithium sulfate, meanwhile, the generated Li2S is uniformly distributed in the etched textile carbon fiber matrixes, and finally forms the TCFs-Li2S composite cathode. Then, by theoretical analysis and experimental exploration of the mechanism for the in-situ synthesis of TCFs-Li2S composite cathodes, an effective process is developed to regulate and control the properties and structures of the TCFs-Li2S composite cathode. Based on these progresses, an in-situ visual-electrochemical test in combination with theoretical calculation will be conducted to further study the mechanism of ion diffusion and electrochemical reaction belonging to the TCFs-Li2S composite cathode, and then clarify the involved correlations among the microstructures, ion diffusion behaviors, properties of interfaces and electrochemical performance. In addition, the kinetics of the ion diffusion, the mechanism for the capacity fading and cycle stability of TCFs-Li2S composite cathodes will be addressed. It is expected that the researches in this project will provide both new ideas and theoretical guidance for the resolution of the problems of Li2S and Li2S-based cathodes, and promotion of the research and development of high stability and light weigh lithium-sulfur batteries.